Test and the mean score turns out
A new test was designed to have a mean of 80 and a standard deviation of 10. A random sample of 20 students at your school take the test and the mean score turns out to be 85. Does the score differ significantly from 80?
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Calculate the p-value and draw conclusions to determine if sales have increased since the new store opened. Use significance level of .01.
At the .05 level of significance, is there evidence of a difference in average appraised values for the single-family homes in the 2 neighborhoods? Set up hypotheses, find p-value, and draw verbal conclusion.
Obtain the p-value for testing if the new spray has significantly increasedmean yield per tree compared to the standard spray, and obtain a 95% two-sided confidence interval for the difference between mean yields. Find the sample size required
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Suppose X and Y have joint density f(x,y) = e^-(x+y) for x,y > 0. Find the distribution function.
Use the binomial function to answer the following questions (there is no data set here): Suppose a shipment of 410 components contains 70 defective and 340 non-defective computer components. From the shipment you take a random sample of 20.When sa
The mean and the standard deviation of the sample of 100 bank customer waiting times in Table 1.8 are (xbar=5.49) and s=2.317. Calculate a t-based 95 percent confidence interval for U, the mean of all possible bank customer waiting times using the
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